#top {
    background-color: aqua;
    color: tomato;
    height: 200px;
    /*垂直居中*/
    line-height: 200px;
    /*水平居中*/
    text-align: center;
}

#middle {
    height: 800px;
}

#left,
#right {
    height: 100%;
    float: left;
    overflow: auto;
}


#left {
    width: 15%;
}

#right {
    width: 85%;
}

#right iframe {
    width: 100%;
    height: 100%;
}

audio {
    display: none;
}

a.flag {
    color: blue;
    font-size: 30px;
}

table {
    border-collapse: collapse;
}

th, td {
    border: 2px solid black;
}

.ftd {
    width: 130px;
}

.std,.ttd {
    width: 60px;
}

#snav {
    display: none;
}